Wireless communication network and adaptive routing communication method thereof

Abstract

A wireless communication network and a method for adaptively selecting a route for communications are disclosed. The wireless communication network includes a central node and a plurality of sub-nodes, of which the sub-nodes include relay nodes and terminal nodes, the central node has a function of routing control for communications in the whole wireless communication network, the relay node has a forwarding function, and the terminal node has a transceiving function. The method includes: generating a global routing table of the wireless communication network based on a predetermined criterion, by the central node independently or in cooperation with a part of the relay nodes; generating a local routing table of each of the sub-nodes based on the global routing table, and informing the local routing tables to the respective sub-nodes to store the local routing tables in the respective sub-nodes, by the central node independently or in cooperation with a part of the relay nodes, the local routing table including paths from the corresponding sub-node to adjacent nodes, wherein the local routing tables of at least a part of the sub-nodes each include a plurality of paths; and adaptively selecting, by the sub-node, a path from the local routing table thereof for communications according to a predetermined rule. According to this invention, chance of collision in communications is reduced, and energy saving is realized.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application claims the priority to Chinese Patent Application No. 200910173078.2, filed on Sep. 10, 2009, which is hereby incorporated by reference in its entirety.FIELD OF THE INVENTION[0002]The present invention relates to a wireless communication network, and more particularly, to a method for adaptively selecting a route for communication in a wireless communication network to reduce the chance of collision in network communications, and a wireless communication network in which the method is implemented. Particularly, the wireless communication network is a wireless sensor network.BACKGROUND OF THE INVENTION[0003]The wireless sensor network (WSN) is a wireless network formed ad hoc by great quantities of sensor nodes with low complexity, and each sensor node in the network includes a sensing module, a processing module, a communicating module, and a power module to carry out the three basic functions of data collection, data rec...

AI Technical Summary

Benefits of technology

[0016]The present invention is proposed in view of the aforementioned problems inherent in the state of the art. An objective of the present invention is to provide a method for adaptively selecting a route for communication in a wireless communication network, which method needs not to perform adaptive regulation of the network node power during the process of communication as is the case in the prior art, but updates / optimizes a global routing table and a local routing table at each sub-node by taking into consideration two factors, namely hop number and relay collision factor (including times of backoff and / or times of packet losses), so as to enable each sub-node to adaptively select a route from the local routing table in accordance with information of the MAC layer to reduce collision as far as practically possible. Thus, time effectiveness of data packet transmission is effectively guaranteed, and excellent energy efficiency is ensured at the same time. Moreover, by setting a time stable threshold, the circumstance is avoided in which relay communication concentrates in a relay node (coordinator) for an unduly long period of time, thereby balancing communication on the entire wireless communication network, elongating the life of the entire network, and hence achieving the objectives to save power consumption and maximize the life of the network.

[0034]According to the present invention, it is possible to reduce the chance of collision in network communications as far as practically possible, to save energy, and to guarantee time effectiveness of communication, and it is possible at the same time to maintain stability of network routing, to balance communication traffic among network nodes, and to prevent individual nodes from exiting the network due to overload, thereby elongating the life period of the entire network as far as possible.

[0035]The present invention achieves the objectives of saving power for the network and maximizing the life period of the network without the support of any additional hardware, possesses excellent expandability, and hence holds a good prospect for future application.

Problems solved by technology

In the wireless sensor network, a node, particularly such as a coordinator and a common node, is usually powered by a battery with extremely limited capacity, and charging or replacement of the battery is often inconvenient or even impossible, thus leading to failure of the node in the wireless sensor network, and resulting in the breakdown of the entire network.

The model simplifies the complex network design, lowers the production cost, and enhances such performances as execution efficiency, but optimization thereof is usually carried out at a specific network layer, so that improvement over the network performance is relatively limited, and enhancement of energy efficiency is usually achieved at the expense of network delay performance.

Adaptive regulation of network node power is a common concept in the current study of cross-layer power saving of the wireless sensor network, but as seen from the currently available wireless sensor network products, power regulation of sensor nodes at the physical layer requires a long initialization process, and is not applicable to the circumstances of frequent changes in network topological structure and data traffic.

Moreover, when other wireless communication networks are concerned, if there is restriction on energy, the problem of saving power for the network should also be considered.

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